main_window: Persist statusBar as a class member

Author: ferdnyc

src/windows/main_window.py

@@ -532,10 +532,6 @@ def open_project(self, file_path, clear_thumbnails=True):
 
                 log.info("Loaded project {}".format(file_path))
             else:
-                # Prepare to use status bar
-                self.statusBar = QStatusBar()
-                self.setStatusBar(self.statusBar)
-
                 log.info("File not found at {}".format(file_path))
                 self.statusBar.showMessage(_("Project {} is missing (it may have been moved or deleted). It has been removed from the Recent Projects menu.".format(file_path)), 5000)
                 self.remove_recent_project(file_path)
@@ -2553,6 +2549,10 @@ def __init__(self, mode=None):
             self.effectsTreeView = EffectsListView(self)
         self.tabEffects.layout().addWidget(self.effectsTreeView)
 
+        # Set up status bar
+        self.statusBar = QStatusBar()
+        self.setStatusBar(self.statusBar)
+
         # Process events before continuing
         # TODO: Figure out why this is needed for a backup recovery to correctly show up on the timeline
         app.processEvents()